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Electrocatalytic Activity of Nitrogen-Doped Carbon Nanotubes Decorated with Gold Nanoparticles

机译：金纳米粒子修饰的掺氮碳纳米管的电催化活性

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摘要

Films consisting of nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs) were fabricated by means of chemical vapor deposition technique and decorated with gold nanoparticles (AuNPs) of different diameters (5, 14, and 35 nm). The electrochemical responses of AuNPs-modified N-MWCNTs films, further denoted as N-MWCNTs/AuNPs, were investigated towards ferrocyanide/ferricyanide, [Fe(CN)6]~(3-)/(4-) redox system in aqueous potassium chloride solutions. The findings reveal strong dependence of film's electrochemical response on diameter of AuNPs. Namely, the electrochemical response expressed in terms of peak current density enhances and the kinetic of electron transfer tends to be faster with the increase of diameter of AuNPs. Furthermore, an obvious improvement of film's detecting capability towards [Fe(CN)6]~(3-)/(4-) occurs with the increase of diameter of AuNPs. The findings demonstrate that by varying the size of AuNPs attached onto N-MWCNTs/AuNPs, the film's electrochemical response and detection capability can be tuned.
机译：通过化学气相沉积技术制备了由氮掺杂的多壁碳纳米管（N-MWCNT）组成的薄膜，并用不同直径（5、14和35 nm）的金纳米粒子（AuNP）装饰。研究了AuNPs修饰的N-MWCNTs薄膜（又称为N-MWCNTs / AuNPs）对钾水溶液中亚铁氰化物/铁氰化物，[Fe（CN）6]〜（3-）/（4-）氧化还原体系的电化学响应氯化物溶液。这些发现揭示了膜的电化学反应对AuNPs直径的强烈依赖性。即，随着AuNP的直径的增加，以峰值电流密度表示的电化学响应增强，并且电子转移的动力学趋于更快。此外，随着AuNPs直径的增加，薄膜对[Fe（CN）6]〜（3-）/（4-）的检测能力明显提高。研究结果表明，通过改变附着在N-MWCNTs / AuNPs上的AuNPs的大小，可以调节薄膜的电化学响应和检测能力。

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